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  #1  
Old 06-10-2021, 9:22 AM
donal_w donal_w is offline
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Default Glock 20SF Ammo Specs

I'm picking up a G20SF to carry in the back country. My original intention was to use 220gr hard cast. Does anyone have Glocks specifications on heavy loads?
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Old 06-10-2021, 9:56 AM
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This seems to be the only guidance I can find from them.


What kind of ammunition should I use in my GLOCK pistol? Can I use +P and +P+ ammunition?

We recommend using ammunition that is manufactured and meets SAAMI or other industry standards, and while some +P ammunition meets these guidelines, +P+ usually does not. This ammunition may generate a higher pressure than standard ammunition, which could shorten the life of the parts of your firearm.
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  #3  
Old 06-10-2021, 10:22 AM
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https://www.buffalobore.com/index.ph...uct_list&c=249

Click on the link
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  #4  
Old 06-10-2021, 11:36 AM
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Quote:
Originally Posted by donal_w View Post
I'm picking up a G20SF to carry in the back country. My original intention was to use 220gr hard cast. Does anyone have Glocks specifications on heavy loads?
Glock recommends against shooting unjacketed bullets because of the polygonal rifling in their barrels. If you're planning to shoot more than a few rounds, I would get an aftermarket barrel with conventional rifling to shoot lead ammo.

Quote:
Originally Posted by donal_w View Post
This seems to be the only guidance I can find from them.


What kind of ammunition should I use in my GLOCK pistol? Can I use +P and +P+ ammunition?

We recommend using ammunition that is manufactured and meets SAAMI or other industry standards, and while some +P ammunition meets these guidelines, +P+ usually does not. This ammunition may generate a higher pressure than standard ammunition, which could shorten the life of the parts of your firearm.
You can get a heavier recoil spring to reduce the wear and tear of full powered 10mm loads.
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  #5  
Old 06-10-2021, 11:38 AM
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I prefer hot rod 180 grain loads over the 200-220. Same reason, in my opinion, lead free 10mm is mostly worthless. Not enough case capacity to get great velocity out of the big long bullets, but a heavy load 180 will do wonderful things.
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Old 06-10-2021, 11:59 AM
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Good thread OP, I’m interested to read some responses as well as I’m picking up a 20SF for the same reason. In the PNW where I hike and camp there are big brown bears and grizzlies, so I’ve been watching a lot of YouTube reviews on what the best 10mm loads are for bear country.
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  #7  
Old 06-10-2021, 12:03 PM
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Buffalo bore or cor-bon for the hot 10mm load.

I load my own 200g moly and I have had zero issues with the factory barrel. YMMV.
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Old 06-10-2021, 12:19 PM
TomReloaded TomReloaded is offline
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Glocks are a little undersprung in 10mm for the really full tilt 10mm loads. They'll shoot just fine, but it batters the gun a little bit.

No one is going to the range and plugging off hundreds of buffalo bore hard cast though. Its sprung for standard fmj stuff and it'll handle the hard cast BB stuff too, just shoot a mag or so of the heavy stuff to verify reliability.

If you truly plan to shoot nothing but full tilt 10mm loads, it would be worth swapping the recoil spring to something heavy, but I think you'll find it unpleasant. That thing can shoot 40sw for range days.

Theres no problem shooting lead out of glocks, just clean your gun regularly.

Last edited by TomReloaded; 06-10-2021 at 12:25 PM..
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Old 06-10-2021, 12:32 PM
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To be realistic, there isn’t anything on two or four legs in CA that your standard 1250 FPS 180 gr fmj load won’t go through both ends.
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  #10  
Old 06-10-2021, 1:02 PM
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Does it have a supported chamber? They like to not do that with their 40's. Probably not a good idea to use +P unless it has a fully supported chamber.
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  #11  
Old 06-10-2021, 3:25 PM
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Swap the barrel out for a barrel approved rounds. And put a 21 pound flat wound recoil spring I find this allows me to shoot low power 40 S&W to the Hottest 10mm and still cycle rounds perfectly.
I agree 180 grain Underwood or 155 Grain Extreme Penetrators will take care of Bussiness.

Last edited by dozer wright; 06-11-2021 at 1:56 PM..
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  #12  
Old 06-10-2021, 5:04 PM
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Quote:
Originally Posted by plumbum View Post
To be realistic, there isnít anything on two or four legs in CA that your standard 1250 FPS 180 gr fmj load wonít go through both ends.
Outstanding!
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  #13  
Old 06-10-2021, 5:15 PM
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Quote:
Originally Posted by TomReloaded View Post
Glocks are a little undersprung in 10mm for the really full tilt 10mm loads. They'll shoot just fine, but it batters the gun a little bit.

No one is going to the range and plugging off hundreds of buffalo bore hard cast though. Its sprung for standard fmj stuff and it'll handle the hard cast BB stuff too, just shoot a mag or so of the heavy stuff to verify reliability.

If you truly plan to shoot nothing but full tilt 10mm loads, it would be worth swapping the recoil spring to something heavy, but I think you'll find it unpleasant. That thing can shoot 40sw for range days.

Theres no problem shooting lead out of glocks, just clean your gun regularly.
Agreed. I use a 22lbs ISMI flatwire spring on a metal guide rod. Heavier loads will put added stresses on a firearm. Thus Iíd Swap out the recoil a lot more often with a 10mm than other caliber pistols. Way less than 3000 rounds, YMMV.
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  #14  
Old 06-10-2021, 5:56 PM
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I recently picked up a G29SF and installed grip sleeves on G20 mags, essentially making it a short barreled G20. I know I will lose some performance from the shorter barrel, but is it significant?
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  #15  
Old 06-10-2021, 6:16 PM
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Longer KKM barrel, 21-22 lb spring, and moly coated underwood 200 grain hard cast...more people are killed by squirrels than grizzlies and moose combined.

Last edited by heavyhaulin818; 06-10-2021 at 9:10 PM..
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  #16  
Old 06-10-2021, 6:24 PM
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Quote:
Originally Posted by heavyhaulin818 View Post
Longer KKM barrel, 21-22 lb spring, and moly coated underwood 300 grain hard cast...more people are killed by squirrels than grizzlies and moose combined.
squirrel-meme-your-worst-nightmare.jpg
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  #17  
Old 06-10-2021, 9:18 PM
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your worst nightmare lol. I believe an ex boss of mine ended up in therapy because of squirrels...no joke. I’ve never been around a grizzly, but everyone should own a glock in 10mm with a couple conversions.
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  #18  
Old 06-10-2021, 9:58 PM
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Quote:
Originally Posted by Sequencer60 View Post
I recently picked up a G29SF and installed grip sleeves on G20 mags, essentially making it a short barreled G20. I know I will lose some performance from the shorter barrel, but is it significant?
Not really anything that would make a difference. Sure you could be losing 100fps with certain loads, but those generally have enough to spare. You can always just add an extended 4.5Ē barrel if youíre trying to eke out performance.
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Old 06-10-2021, 10:12 PM
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You can shoot hard cast bullets through a Glock barrel. Here is one link to an article from Buffalo bore about that subject: https://www.buffalobore.com/index.ph...duct_list&c=59

The issue is with lead alloy bullets that do cause fouling of the barrels. Lead hard cast bullets do not.

I have a Gen 4 G29 that I purchased many years ago to use as a backwoods gun for when I visit grizzly country. The factory 19 lb guide rod is too weak for hot 10 mm loads which really beats up the frame. I switched to a stainless steel 23 lb guide rod which greatly tamed the recoil of the hot 10 mm rounds. I use the 19 lb recoil spring when I shoot .40 cal ammo.

In the past I used Underwood 220 grain hardcast rounds. When I carry out of state, I use a sleeve extention and G20 mags so I have 15+1 rounds.

I did get some G20 mags during Freedom Week so I can use those in CA.

For backwoods carry in CA I now carry Underwood 140 grain Xtreme Penetrator Copper ammo that is rated for dangerous game such as grizzlies.
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  #20  
Old 06-11-2021, 11:09 AM
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I'm off topic but the Glock 20 (I don't remember if it was SF) often is available to add to cart and purchase at 11:30 PM Sportsman Warehouse website but goes away during the day. Then comes back the next night or maybe 3 nights later.

This has been typical for weeks now for many of their Cal compliant handguns, the number of available will always just about double every single night for a few hours around that time.
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Old 06-11-2021, 12:44 PM
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Quote:
Originally Posted by Darto View Post
I'm off topic but the Glock 20 (I don't remember if it was SF) often is available to add to cart and purchase at 11:30 PM Sportsman Warehouse website but goes away during the day. Then comes back the next night or maybe 3 nights later.

This has been typical for weeks now for many of their Cal compliant handguns, the number of available will always just about double every single night for a few hours around that time.
Good observation though. I generally check in the AM. Might need to change that up
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  #22  
Old 06-11-2021, 1:27 PM
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I run the Buffalo bore 180gr jhp's in my G20 for personal protection. I read mixed things on the hard cast rounds so I went with the jhp's. As stated before though, pretty much any 180gr round in 10mm will put down any threat.
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  #23  
Old 06-11-2021, 6:56 PM
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Lately my favorite is my Glock 29SF.
I favor Underwood Ammo 140 Grain Extreme Penetrators and
I have some Black Talon and Double Tap (hard cast for that imaginary bear here
in Orange County)

I love shooting .40 thru a Glock in 10MM and even so called Hot .40 in a
Glock 22 (thinner frame) is a powder puff in tha Fat framed Glock 20, 29 .

For kicks Iíve loaded my magazine with 10-40-10-40-10-40 etc and itís really
apparent how weak the 40 feels and how strong the 10 is.
Night and Day.

I do install a 22 LB. recoil spring so the frame doesnít get battered..

I reload and I have lots of reloading experience in 10MM. My favorite is
135 Grain NOSLER at 1500 plus FPS and itís like a lightning bolt. Hardly any recoil. You can get this load from Kevin (Underwood) but of course itís cheaper to reload. .

The stock Glock 20 barrel is 4.61 inches but what I did was install a new KKM
Stainless barrel and itís actually 4.7 inches long. More than the Glock 20.
You just specify in the comments section when you order the barrel and you
Get the length you ask for. KKM is a fantastic quality barrel manufacturer.

Yeah I only run my freedom week 15 rounders. Really a sweet set up.

Be well
Bob



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  #24  
Old 06-12-2021, 8:18 AM
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Anything out of a 10mm will work in CA. I do remember reading several folks had malfunctions with 220 grain, seemed 200 was the sweet spot.
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Old 06-12-2021, 9:31 AM
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I am using Underwood 200grain fmj for the wood.


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Old 06-12-2021, 9:55 AM
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Underwood has some excellent 10mm loads.
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